DIY Doctor

Main navigation

Concrete Base over Existing Foundations for Small Concrete Garage

Postby 5 Bobs » Fri Jun 10, 2016 2:51 pm

Hi I'm in the process of laying a 4 x 3 mtr slab to build a small concrete sectional garage on top of.
My initial plan has been to and remove 150mm of soil and then to refill with 100mm of hardcore and then sand, dpm and 100mm of concrete.
How ever once soil removed I have come across the foundations for the outside wall to our garden this runs the length of my base and about 30-40cm wide. My question is how do I include this into my base? If I just concrete over then it will mean at that point the new concrete will only be about 50mm thick over the old.
If this ok to do what do I do about the dpm? Laying it inbetween the old and new concrete doesn't sound right!
Many thanks for any help advice.
5 Bobs
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Fri Jun 10, 2016 12:42 pm


Simply Build It

Postby RICKSGARAGE » Fri Dec 23, 2016 12:17 pm

Hi, I see nobody replied to your question but my problem is similar. I want to extend my single skin 5mx5m block garage by about 11m2 ( 5x2.2m) so not unlike your size project.It will be a workshop and the car will not be parked on the new area. Did you find your 100mm hardcore, 50mm sand and 100mm concrete works. I'm thinking it should be more than enough but some talk about 750mm deep trench and 150mm reinforced slab as well.
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Fri Dec 23, 2016 11:37 am

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics